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If by dropping a stone in a quiet lake a...

If by dropping a stone in a quiet lake a wave moves in circle at a speed of 3.5cm/sec, then the rate of increase of the enclosed circular region when the radius of the circular wave is 10 cm, is `(pi=(22)/(7))`

A

220 sq. cm/sec

B

110 sq. cm/sec

C

35 sq. cm/sec

D

350 sq. cm/sec

Text Solution

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The correct Answer is:
A
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